RT9133A RICHTEK [Richtek Technology Corporation], RT9133A Datasheet - Page 9

• Manufacturer Part Number: RT9133A
• Description: Rail-to-Rail Operational Amplifier
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Applications Information
The RT9133A/B has high performance to drive large load
for different application. High slew rates, rail-to-rail input
and output capability and low power consumption are the
features to make the RT9133A/B ideal for LCD applications.
The RT9133A/B also has wide bandwidth and phase margin
to drive a load of 10kΩ and 10pF.
Operating Voltage
The RT9133A/B is specified with single supply voltage
from 5V to 15V. According to the electrical characteristics,
the total supply voltage range is guaranteed from 4.5V to
15V. To
specifications in wide range of temperature and operating
voltage.
The output swing of the RT9133A/B typically extends to
within 80mV of positive/negative supply rails with 5mA
load current source/sink. Decreasing the load current will
get output swing even closer to the supply rails. Figure 1
shows the rail-to-rail input and output waveforms in the
unit gain configuration without load current. The supply
rails are +/-5V. Applying an input 10Vp_p sinusoidal
waveform results in a 9.8Vp_p output voltage as shown in
Figure 1.
Power Dissipation
The maximum power dissipation depends on the thermal
resistance of IC package, PCB layout, the rate of
surroundings airflow and temperature difference between
DS9133A/B-04 August 2007
Figure 1. Operation with Rail-to-Rail Input and Output
refer the typical operational curves can get stable
Time (250μs/Div)
Preliminary
junction to ambient. The maximum power dissipation can
be calculated by following formula:
P
Where
T
150°C
T
θ
The recommended operating condition of RT9133A/B is
below the maximum junction temperature 150°C of the
die. The junction to ambient thermal resistance for
SOT-23-5 package is 250°C/W,
is 165°C/W and MSOP-8 package is 160°C/W on the
standard JEDEC 51-3 single layer thermal test board. The
maximum power dissipation at T
by following formula:
P
P
P
For continuous operation, do not exceed absolute
maximum operation junction temperature 150°C. The
power dissipation definition for the RT9133A/B is as
following:
P
V
V
I
The maximum power dissipation depends on operating
ambient temperature for fixed T
resistance θ
derating curves of the RT9133A/B with different packages.
As the ambient temperature increases, the maximum
power dissipation decreases linearly to keep the junction
temperature below 150°C.
Load
JA
J(MAX)
A
D(MAX)
D(MAX)
D(MAX)
D(MAX)
D
S
OUT
: The ambient temperature.
: the supply voltage
= (V
: The junction to ambient thermal resistance.
: the output load current
: the output voltage
: The maximum operation junction temperature
= (150°C−25°C) / 250 = 500mW (SOT-23-5)
S
= ( T
= (150°C−25°C) / 165 = 758mW (WDFN-6L 2x2)
= ( 150°C - 25°C ) / 160 = 781mW (MSOP-8)
- V
OUT
J(MAX)
JA
. Figure 2 shows the power dissipation
) x I
- T
Load
A
) /θ
JA
A
RT9133A/B
= 25°C can be calculated
WDFN-6L 2x2 package
J(MAX)
www.richtek.com
and thermal
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